Hello,
syzbot found the following crash on:
HEAD commit: ae179410 usb: gadget: add raw-gadget interface
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
bcdDevice=69.6a
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: string descriptor 0 read error: -71
uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
==================================================================
BUG: KASAN: use-after-free in uvc_register_terms
drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
BUG: KASAN: use-after-free in uvc_register_chains
drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
drivers/media/usb/uvc/uvc_driver.c:2201
Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
CPU: 1 PID: 94 Comm: kworker/1:2 Not tainted 5.5.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xef/0x16e lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
__kasan_report.cold+0x37/0x85 mm/kasan/report.c:506
kasan_report+0xe/0x20 mm/kasan/common.c:639
uvc_register_terms drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
uvc_probe.cold+0x2193/0x29de drivers/media/usb/uvc/uvc_driver.c:2201
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Allocated by task 94:
save_stack+0x1b/0x80 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:670 [inline]
uvc_alloc_chain+0x48/0xfa drivers/media/usb/uvc/uvc_driver.c:1692
uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1818 [inline]
uvc_probe.cold+0x15f0/0x29de drivers/media/usb/uvc/uvc_driver.c:2197
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 94:
save_stack+0x1b/0x80 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x117/0x160 mm/kasan/common.c:474
slab_free_hook mm/slub.c:1425 [inline]
slab_free_freelist_hook mm/slub.c:1458 [inline]
slab_free mm/slub.c:3005 [inline]
kfree+0xd5/0x300 mm/slub.c:3957
uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1825 [inline]
uvc_probe.cold+0x16fd/0x29de drivers/media/usb/uvc/uvc_driver.c:2197
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d4f1bc00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 46 bytes inside of
256-byte region [ffff8881d4f1bc00, ffff8881d4f1bd00)
The buggy address belongs to the page:
page:ffffea000753c680 refcount:1 mapcount:0 mapping:ffff8881da002780
index:0x0 compound_mapcount: 0
raw: 0200000000010200 ffffea000753c600 0000000300000003 ffff8881da002780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881d4f1bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881d4f1bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881d4f1bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881d4f1bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d4f1bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
Am Montag, den 13.01.2020, 04:24 -0800 schrieb syzbot:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
>
> usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> bcdDevice=69.6a
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> usb 1-1: config 0 descriptor??
> usb 1-1: string descriptor 0 read error: -71
> uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> ==================================================================
> BUG: KASAN: use-after-free in uvc_register_terms
> drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> BUG: KASAN: use-after-free in uvc_register_chains
> drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> drivers/media/usb/uvc/uvc_driver.c:2201
> Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
#syz test: https://github.com/google/kasan.git ae179410
From db844641a5e30f3cfc0ce9cde156b3cc356b6c0c Mon Sep 17 00:00:00 2001
From: Oliver Neukum <[email protected]>
Date: Mon, 10 Feb 2020 15:10:36 +0100
Subject: [PATCH] UVC: deal with unnamed streams
The pointer can be NULL
Signed-off-by: Oliver Neukum <[email protected]>
---
drivers/media/usb/uvc/uvc_driver.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 99883550375e..26558a89f2fe 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2069,7 +2069,8 @@ static int uvc_register_terms(struct uvc_device *dev,
stream = uvc_stream_by_id(dev, term->id);
if (stream == NULL) {
uvc_printk(KERN_INFO, "No streaming interface found "
- "for terminal %u.", term->id);
+ "for terminal %u.",
+ term->id ? term->id : "(Unnamed)");
continue;
}
--
2.16.4
Hi Oliver,
Thank you for the patch.
On Mon, Feb 10, 2020 at 03:13:26PM +0100, Oliver Neukum wrote:
> Am Montag, den 13.01.2020, 04:24 -0800 schrieb syzbot:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> > git tree: https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> > dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> > bcdDevice=69.6a
> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > usb 1-1: config 0 descriptor??
> > usb 1-1: string descriptor 0 read error: -71
> > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> > ==================================================================
> > BUG: KASAN: use-after-free in uvc_register_terms
> > drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> > BUG: KASAN: use-after-free in uvc_register_chains
> > drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> > BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> > drivers/media/usb/uvc/uvc_driver.c:2201
> > Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
>
> #syz test: https://github.com/google/kasan.git ae179410
>
> From db844641a5e30f3cfc0ce9cde156b3cc356b6c0c Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <[email protected]>
> Date: Mon, 10 Feb 2020 15:10:36 +0100
> Subject: [PATCH] UVC: deal with unnamed streams
>
> The pointer can be NULL
>
> Signed-off-by: Oliver Neukum <[email protected]>
> ---
> drivers/media/usb/uvc/uvc_driver.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 99883550375e..26558a89f2fe 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2069,7 +2069,8 @@ static int uvc_register_terms(struct uvc_device *dev,
> stream = uvc_stream_by_id(dev, term->id);
> if (stream == NULL) {
> uvc_printk(KERN_INFO, "No streaming interface found "
> - "for terminal %u.", term->id);
> + "for terminal %u.",
> + term->id ? term->id : "(Unnamed)");
Have you tried compiling this ?
> continue;
> }
>
--
Regards,
Laurent Pinchart
Hello,
syzbot has tested the proposed patch but the reproducer still triggered crash:
KASAN: use-after-free Read in uvc_probe
usb 2-1: string descriptor 0 read error: -71
uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
==================================================================
BUG: KASAN: use-after-free in uvc_register_terms drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
BUG: KASAN: use-after-free in uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2071 [inline]
BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29fe drivers/media/usb/uvc/uvc_driver.c:2202
Read of size 2 at addr ffff8881d933182e by task kworker/0:2/95
CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.5.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xef/0x16e lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
__kasan_report.cold+0x37/0x85 mm/kasan/report.c:506
kasan_report+0xe/0x20 mm/kasan/common.c:639
uvc_register_terms drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2071 [inline]
uvc_probe.cold+0x2193/0x29fe drivers/media/usb/uvc/uvc_driver.c:2202
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Allocated by task 95:
save_stack+0x1b/0x80 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:670 [inline]
uvc_alloc_chain+0x48/0xfa drivers/media/usb/uvc/uvc_driver.c:1692
uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1818 [inline]
uvc_probe.cold+0x15f0/0x29fe drivers/media/usb/uvc/uvc_driver.c:2198
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 95:
save_stack+0x1b/0x80 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x117/0x160 mm/kasan/common.c:474
slab_free_hook mm/slub.c:1425 [inline]
slab_free_freelist_hook mm/slub.c:1458 [inline]
slab_free mm/slub.c:3005 [inline]
kfree+0xd5/0x300 mm/slub.c:3957
uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1825 [inline]
uvc_probe.cold+0x16fd/0x29fe drivers/media/usb/uvc/uvc_driver.c:2198
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
really_probe+0x290/0xad0 drivers/base/dd.c:548
driver_probe_device+0x223/0x350 drivers/base/dd.c:721
__device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x390 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1459/0x1bf0 drivers/base/core.c:2487
usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d9331800
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 46 bytes inside of
256-byte region [ffff8881d9331800, ffff8881d9331900)
The buggy address belongs to the page:
page:ffffea000764cc00 refcount:1 mapcount:0 mapping:ffff8881da002780 index:0x0 compound_mapcount: 0
raw: 0200000000010200 ffffea0007648d80 0000000e0000000e ffff8881da002780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881d9331700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881d9331780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881d9331800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881d9331880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881d9331900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Tested on:
commit: ae179410 usb: gadget: add raw-gadget interface
git tree: https://github.com/google/kasan.git
console output: https://syzkaller.appspot.com/x/log.txt?x=13d466e9e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
patch: https://syzkaller.appspot.com/x/patch.diff?x=16022395e00000
Am Montag, den 10.02.2020, 16:18 +0200 schrieb Laurent Pinchart:
> Hi Oliver,
>
> Thank you for the patch.
>
> On Mon, Feb 10, 2020 at 03:13:26PM +0100, Oliver Neukum wrote:
> > Am Montag, den 13.01.2020, 04:24 -0800 schrieb syzbot:
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> > > git tree: https://github.com/google/kasan.git usb-fuzzer
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: [email protected]
> > >
> > > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> > > bcdDevice=69.6a
> > > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > usb 1-1: config 0 descriptor??
> > > usb 1-1: string descriptor 0 read error: -71
> > > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> > > ==================================================================
> > > BUG: KASAN: use-after-free in uvc_register_terms
> > > drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> > > BUG: KASAN: use-after-free in uvc_register_chains
> > > drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> > > BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> > > drivers/media/usb/uvc/uvc_driver.c:2201
> > > Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
> >
> > #syz test: https://github.com/google/kasan.git ae179410
> >
> > From db844641a5e30f3cfc0ce9cde156b3cc356b6c0c Mon Sep 17 00:00:00 2001
> > From: Oliver Neukum <[email protected]>
> > Date: Mon, 10 Feb 2020 15:10:36 +0100
> > Subject: [PATCH] UVC: deal with unnamed streams
> >
> > The pointer can be NULL
> >
> > Signed-off-by: Oliver Neukum <[email protected]>
> > ---
> > drivers/media/usb/uvc/uvc_driver.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > index 99883550375e..26558a89f2fe 100644
> > --- a/drivers/media/usb/uvc/uvc_driver.c
> > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > @@ -2069,7 +2069,8 @@ static int uvc_register_terms(struct uvc_device *dev,
> > stream = uvc_stream_by_id(dev, term->id);
> > if (stream == NULL) {
> > uvc_printk(KERN_INFO, "No streaming interface found "
> > - "for terminal %u.", term->id);
> > + "for terminal %u.",
> > + term->id ? term->id : "(Unnamed)");
>
> Have you tried compiling this ?
Yes. It does compile. Why?
Regards
Oliver
Hi Oliver,
On Tue, Feb 11, 2020 at 03:31:30PM +0100, Oliver Neukum wrote:
> Am Montag, den 10.02.2020, 16:18 +0200 schrieb Laurent Pinchart:
> > On Mon, Feb 10, 2020 at 03:13:26PM +0100, Oliver Neukum wrote:
> > > Am Montag, den 13.01.2020, 04:24 -0800 schrieb syzbot:
> > > > Hello,
> > > >
> > > > syzbot found the following crash on:
> > > >
> > > > HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> > > > git tree: https://github.com/google/kasan.git usb-fuzzer
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> > > > kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> > > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
> > > >
> > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > Reported-by: [email protected]
> > > >
> > > > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> > > > bcdDevice=69.6a
> > > > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > > usb 1-1: config 0 descriptor??
> > > > usb 1-1: string descriptor 0 read error: -71
> > > > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> > > > ==================================================================
> > > > BUG: KASAN: use-after-free in uvc_register_terms
> > > > drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> > > > BUG: KASAN: use-after-free in uvc_register_chains
> > > > drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> > > > BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> > > > drivers/media/usb/uvc/uvc_driver.c:2201
> > > > Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
> > >
> > > #syz test: https://github.com/google/kasan.git ae179410
> > >
> > > From db844641a5e30f3cfc0ce9cde156b3cc356b6c0c Mon Sep 17 00:00:00 2001
> > > From: Oliver Neukum <[email protected]>
> > > Date: Mon, 10 Feb 2020 15:10:36 +0100
> > > Subject: [PATCH] UVC: deal with unnamed streams
> > >
> > > The pointer can be NULL
> > >
> > > Signed-off-by: Oliver Neukum <[email protected]>
> > > ---
> > > drivers/media/usb/uvc/uvc_driver.c | 3 ++-
> > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > index 99883550375e..26558a89f2fe 100644
> > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > @@ -2069,7 +2069,8 @@ static int uvc_register_terms(struct uvc_device *dev,
> > > stream = uvc_stream_by_id(dev, term->id);
> > > if (stream == NULL) {
> > > uvc_printk(KERN_INFO, "No streaming interface found "
> > > - "for terminal %u.", term->id);
> > > + "for terminal %u.",
> > > + term->id ? term->id : "(Unnamed)");
> >
> > Have you tried compiling this ?
>
> Yes. It does compile. Why?
Because term->id is a u8, "(Unnamed)" is a const char *, and %u requires
an integer. I'm surprised the compiler doesn't complain, but in any
case, it's not right :-)
--
Regards,
Laurent Pinchart
Am Dienstag, den 11.02.2020, 17:38 +0200 schrieb Laurent Pinchart:
> Hi Oliver,
>
> On Tue, Feb 11, 2020 at 03:31:30PM +0100, Oliver Neukum wrote:
> > Am Montag, den 10.02.2020, 16:18 +0200 schrieb Laurent Pinchart:
> > > On Mon, Feb 10, 2020 at 03:13:26PM +0100, Oliver Neukum wrote:
> > > > Am Montag, den 13.01.2020, 04:24 -0800 schrieb syzbot:
> > > > > Hello,
> > > > >
> > > > > syzbot found the following crash on:
> > > > >
> > > > > HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> > > > > git tree: https://github.com/google/kasan.git usb-fuzzer
> > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> > > > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
> > > > >
> > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > > Reported-by: [email protected]
> > > > >
> > > > > usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> > > > > bcdDevice=69.6a
> > > > > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > > > usb 1-1: config 0 descriptor??
> > > > > usb 1-1: string descriptor 0 read error: -71
> > > > > uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> > > > > ==================================================================
> > > > > BUG: KASAN: use-after-free in uvc_register_terms
> > > > > drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> > > > > BUG: KASAN: use-after-free in uvc_register_chains
> > > > > drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> > > > > BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> > > > > drivers/media/usb/uvc/uvc_driver.c:2201
> > > > > Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
> > > >
> > > > #syz test: https://github.com/google/kasan.git ae179410
> > > >
> > > > From db844641a5e30f3cfc0ce9cde156b3cc356b6c0c Mon Sep 17 00:00:00 2001
> > > > From: Oliver Neukum <[email protected]>
> > > > Date: Mon, 10 Feb 2020 15:10:36 +0100
> > > > Subject: [PATCH] UVC: deal with unnamed streams
> > > >
> > > > The pointer can be NULL
> > > >
> > > > Signed-off-by: Oliver Neukum <[email protected]>
> > > > ---
> > > > drivers/media/usb/uvc/uvc_driver.c | 3 ++-
> > > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > > index 99883550375e..26558a89f2fe 100644
> > > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > > @@ -2069,7 +2069,8 @@ static int uvc_register_terms(struct uvc_device *dev,
> > > > stream = uvc_stream_by_id(dev, term->id);
> > > > if (stream == NULL) {
> > > > uvc_printk(KERN_INFO, "No streaming interface found "
> > > > - "for terminal %u.", term->id);
> > > > + "for terminal %u.",
> > > > + term->id ? term->id : "(Unnamed)");
> > >
> > > Have you tried compiling this ?
> >
> > Yes. It does compile. Why?
>
> Because term->id is a u8, "(Unnamed)" is a const char *, and %u requires
> an integer. I'm surprised the compiler doesn't complain, but in any
> case, it's not right :-)
>
Oi, damnation, you are right. For some reason I saw a %s there.
Sorry
Oliver
On Mon, Jan 13, 2020 at 1:24 PM syzbot
<[email protected]> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: ae179410 usb: gadget: add raw-gadget interface
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=132223fee00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=ad1d751a3a72ae57
> dashboard link: https://syzkaller.appspot.com/bug?extid=9a48339b077c5a80b869
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16857325e00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e069ee00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
>
> usb 1-1: New USB device found, idVendor=0bd3, idProduct=0555,
> bcdDevice=69.6a
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> usb 1-1: config 0 descriptor??
> usb 1-1: string descriptor 0 read error: -71
> uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0555)
> ==================================================================
> BUG: KASAN: use-after-free in uvc_register_terms
> drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> BUG: KASAN: use-after-free in uvc_register_chains
> drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> BUG: KASAN: use-after-free in uvc_probe.cold+0x2193/0x29de
> drivers/media/usb/uvc/uvc_driver.c:2201
> Read of size 2 at addr ffff8881d4f1bc2e by task kworker/1:2/94
>
> CPU: 1 PID: 94 Comm: kworker/1:2 Not tainted 5.5.0-rc3-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0xef/0x16e lib/dump_stack.c:118
> print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
> __kasan_report.cold+0x37/0x85 mm/kasan/report.c:506
> kasan_report+0xe/0x20 mm/kasan/common.c:639
> uvc_register_terms drivers/media/usb/uvc/uvc_driver.c:2038 [inline]
> uvc_register_chains drivers/media/usb/uvc/uvc_driver.c:2070 [inline]
> uvc_probe.cold+0x2193/0x29de drivers/media/usb/uvc/uvc_driver.c:2201
> usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
> generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
> hub_port_connect drivers/usb/core/hub.c:5184 [inline]
> hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
> port_event drivers/usb/core/hub.c:5470 [inline]
> hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
> process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
> worker_thread+0x96/0xe20 kernel/workqueue.c:2410
> kthread+0x318/0x420 kernel/kthread.c:255
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Allocated by task 94:
> save_stack+0x1b/0x80 mm/kasan/common.c:72
> set_track mm/kasan/common.c:80 [inline]
> __kasan_kmalloc mm/kasan/common.c:513 [inline]
> __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486
> kmalloc include/linux/slab.h:556 [inline]
> kzalloc include/linux/slab.h:670 [inline]
> uvc_alloc_chain+0x48/0xfa drivers/media/usb/uvc/uvc_driver.c:1692
> uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1818 [inline]
> uvc_probe.cold+0x15f0/0x29de drivers/media/usb/uvc/uvc_driver.c:2197
> usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
> generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
> hub_port_connect drivers/usb/core/hub.c:5184 [inline]
> hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
> port_event drivers/usb/core/hub.c:5470 [inline]
> hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
> process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
> worker_thread+0x96/0xe20 kernel/workqueue.c:2410
> kthread+0x318/0x420 kernel/kthread.c:255
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Freed by task 94:
> save_stack+0x1b/0x80 mm/kasan/common.c:72
> set_track mm/kasan/common.c:80 [inline]
> kasan_set_free_info mm/kasan/common.c:335 [inline]
> __kasan_slab_free+0x117/0x160 mm/kasan/common.c:474
> slab_free_hook mm/slub.c:1425 [inline]
> slab_free_freelist_hook mm/slub.c:1458 [inline]
> slab_free mm/slub.c:3005 [inline]
> kfree+0xd5/0x300 mm/slub.c:3957
> uvc_scan_device drivers/media/usb/uvc/uvc_driver.c:1825 [inline]
> uvc_probe.cold+0x16fd/0x29de drivers/media/usb/uvc/uvc_driver.c:2197
> usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:361
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_set_configuration+0xe47/0x17d0 drivers/usb/core/message.c:2023
> generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> usb_probe_device+0xaf/0x140 drivers/usb/core/driver.c:266
> really_probe+0x290/0xad0 drivers/base/dd.c:548
> driver_probe_device+0x223/0x350 drivers/base/dd.c:721
> __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:828
> bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
> __device_attach+0x217/0x390 drivers/base/dd.c:894
> bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
> device_add+0x1459/0x1bf0 drivers/base/core.c:2487
> usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2537
> hub_port_connect drivers/usb/core/hub.c:5184 [inline]
> hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
> port_event drivers/usb/core/hub.c:5470 [inline]
> hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5552
> process_one_work+0x945/0x15c0 kernel/workqueue.c:2264
> worker_thread+0x96/0xe20 kernel/workqueue.c:2410
> kthread+0x318/0x420 kernel/kthread.c:255
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> The buggy address belongs to the object at ffff8881d4f1bc00
> which belongs to the cache kmalloc-256 of size 256
> The buggy address is located 46 bytes inside of
> 256-byte region [ffff8881d4f1bc00, ffff8881d4f1bd00)
> The buggy address belongs to the page:
> page:ffffea000753c680 refcount:1 mapcount:0 mapping:ffff8881da002780
> index:0x0 compound_mapcount: 0
> raw: 0200000000010200 ffffea000753c600 0000000300000003 ffff8881da002780
> raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8881d4f1bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881d4f1bb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8881d4f1bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff8881d4f1bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8881d4f1bd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
Fixed by something.
#syz invalid